Make Struct available on all workers

General Usage
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1

I am using Distributed.jl and DistributedArrays.jl to write code that runs in parallel and I want to make a certain struct available to all processes, because they all need to (only) read from it several times every time I call a function remotely.

I.e. I have

using DistributedArrays
struct A
    [...]
end
struct B
    [...]
end
struct MyType
    a::A
    Db::DArray{B,1,Array{B,1}}
end
function f(a::A, Db::DArray{B,1,Array{B,1}})
    do_something_to_b(a, Db[:L])
end
a = A([...]); b1 = B([...]); b2 = B([...])
M = MyType(a, distribute([b1,b2]))
for i in 1:N
    SPMD.spmd(f, M.a, M.Db, pids=workers())
end

This way it works, however, I suppose that a is copied to all the workers N times, instead of just once.
How can I make it more efficient?